Re: OS/2 2.11: TCP/IP over 384 kb/s satellite link

From: Chin Sheng-Der (sdchin@ee.ntu.edu.tw)
Date: Sat Jan 10 1998 - 16:42:50 EST


On Thu, 8 Jan 1998, Hans Kruse wrote:

> At 13:34 -0500 1/8/98, Bettina Pieper wrote:
> >Please help, if you have any idea:
> >We have a direct satellite link between Russia and Germany. One PC and
> >one Router on both sides and in between the satellite. Our link should
> >provide a transparent TCP/IP connection with 384 kb/s. We are using
> >OS2/2.11 and IBM TCP/IP version 2.0 for data transfer. The effective
> >data rate is much too low to be used for any data transfer.
>
> What is your observed data rate?
>
>
> >
> >Problem: How could we get access to the TCP/IP parameters that should be
> >changed? Tcpipcfg does not offer enough parameters to change.
>
> I am not familiar with tcpipcfg. However, to "load" the 384kbps link you
> need a TCP window of about 26K. You routers must allow the same amount of
> data in the queue.

      Why a TCP window of about 26K is needed ?
       Can you show me your calculation...
                                         Thank you very much.



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